JPH11208632A - Plastic bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve expandability of contents in a bottle at the time of uncapping the bottle and improve bubbling properties of the contents when they are poured into a cup, etc. SOLUTION: This plastic bottle contains 0.01-3 wt.% of fine particles whose mean size is at least 0.05 μm and at most 1 μm. The plastic bottle is a bottle formed of polyethylene terephthalate, polyethylene naphthalenedicarboxylate, and one or more of polyesters selected from among groups comprising copolymers of polyethylene terephthalate and polyethylene naphthalenedicarboxylate, and blends thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic bottle, and more particularly to a plastic bottle which is filled with a carbon dioxide-containing beverage such as beer or champagne, and has an appropriate foaming property when opened and when transferred to a container such as a cup. A plastic bottle having the same.

[0002]

2. Description of the Related Art Demand for plastic bottles has increased significantly as a substitute for glass bottles due to their light weight and safety when dropped. In recent years, small plastic bottles have attracted attention as alternatives to conventional steel cans and aluminum cans due to their resealability and the ability to see the contents.

[0003]

However, when a plastic bottle is used as a container for carbonated beverages such as beer and champagne, foams unique to carbonated beverages are less generated when the bottle is opened or poured into a cup or the like. Do not irritate.
In particular, in the case of champagne, it is essential to blow bubbles when opening the bottle. It is an object of the present invention to improve these points, to improve the foaming property of the contents when the bottle is opened, and to improve the generation of bubbles when poured into a cup or the like.

[0004]

That is, according to the present invention, fine particles having an average particle size of 0.05 μm or more and 1 μm or less are added to a fine particle.
It is a plastic bottle characterized in that it contains 0.1 to 3% by weight.

The plastic bottles of the present invention include polyethylene terephthalate (hereinafter sometimes abbreviated as PET), polyethylene naphthalenedicarboxylate (hereinafter sometimes abbreviated as PEN), polyethylene terephthalate and polyethylene naphthalenedicarboxylate. And monolayer and multilayer bottles formed from polyethylene terephthalate and polyethylene naphthalene dicarboxylate blends, polyacrylonitrile, ethylene-vinyl alcohol copolymer, polyamide and the like.

[0006] The plastic in the present invention is not limited by its manufacturing method. Of course, it may be one obtained by copolymerizing another monomer component for the purpose of modification or the like, or one added with additives such as an ultraviolet absorber, a polymer stabilizer, and a plasticizer.

Further, two or more plastics may be used. Strength in the case of a bottle, from the viewpoint of gas barrier performance, polyethylene terephthalate, a bottle composed of polyethylene naphthalene dicarboxylate or a copolymer or blend of polyethylene terephthalate and polyethylene naphthalene dicarboxylate, at least polyethylene terephthalate and ethylene-vinyl alcohol A multilayer bottle composed of three layers or a multilayer bottle composed of at least three layers of polyethylene terephthalate and polyamide is particularly preferred.

The present invention is characterized in that 0.01 to 3% by weight of fine particles having an average particle diameter of 0.05 μm or more and 1 μm or less are contained in order to impart sufficient bubble blowing properties to the bottle.

Examples of the fine particles include inorganic particles such as spherical silica, alumina, calcium carbonate, calcium phosphate and zeolite, and organic particles such as cross-linked polystyrene. Above all, when spherical silica or zeolite is used, the foam blowing property and the transparency of the bottle are particularly excellent, which is preferable. In addition, from the viewpoint of the transparency of the bottle, the added fine particles preferably have a sharp particle size distribution,
The relative standard deviation representing the steepness of the distribution is preferably 0.5 or less, more preferably 0.3 or less. This relative standard deviation is represented by the following equation (Equation 1).

[0010]

(Equation 1)

## EQU1 ##

In the present invention, the fine particles have an average particle size of 0.1.
It is necessary to be not less than 05 μm and not more than 1 μm. If the average particle size is less than 0.05 μm, the bubble blowing properties of the bottle will be insufficient, while if it exceeds 1 μm, the bottle will have poor transparency.
Further, the content needs to be 0.01 to 3% by weight. If the content is less than 0.01% by weight, the bubble blowing properties of the bottle become insufficient, and if it exceeds 3% by weight, the transparency of the bottle deteriorates. Means for incorporating the fine particles into the plastic bottle include adding the fine particles to the polymer during the production of the polymer, or blending the fine particles with the polymer so as to have a predetermined fine particle content during bottle molding, A method of blending a polymer with a polymer can be exemplified.

The bottle of the present invention is not limited by its molding method. For example, a raw material pellet is formed into a preform by an injection molding method, and the preform is heated to a temperature at which the body can be blown by an infrared heater or the like, and then a bottle having a desired shape can be obtained by a blow molding method. .

The bottle of the present invention is not limited by its shape. Preferably, the bottle is exemplified by a bottle having a body thickness of 150 to 450 μm and a stretch ratio at blow molding of 2 to 15 times the area ratio.

[0015]

The present invention will be further described below with reference to examples. The characteristics of the bottle were evaluated by the following methods. Foam blowing: Each bottle is filled with 500 mL of beer,
After stoppering, the mixture was stored at 7 ° C. for 24 hours, and then immediately opened by hand. The case where the height of the foam growing at the time of opening the beer was 3 cm or more higher than the liquid level of the beer before opening was evaluated as ○, and the case where it was not the case was evaluated as ×. Transparency: The haze of the body of the bottle was measured using a haze meter, and when the value was less than 5%, it was evaluated as ○, and when it was 5% or more, it was evaluated as x.

The following polymers were used as the polymers described in the table. PET: polyethylene terephthalate resin; Teijin Limited
TR-8580H (IV = 0.83) PEN: polyethylene naphthalene dicarboxylate resin; TN-8070 (IV = 0.7) manufactured by Teijin Limited
1)

Examples 1 to 5 and Comparative Examples 1 to 5 After drying the polymer compositions shown in Table 1 at 160 ° C. for 4 hours, the basis weight was 5 using an injection molding machine M-100DM manufactured by Meiki Seisakusho Co., Ltd.
A preform of 5 g screw screw cap type was molded, and a 500 mL (total volume of 526 mL) petaloid type bottle was obtained using the preform with a blow molding machine manufactured by Cincinnati Milacron. About these bottles, bubble blowing property and transparency were evaluated. Table 1 shows the results.

[0018]

[Table 1]

[0019]

According to the present invention, it is possible to obtain a bottle which has good foaming properties of the contents when the bottle is opened and shows good foaming properties when poured into a cup or the like.

Claims (4)

[Claims] 1. A plastic bottle containing 0.01 to 3% by weight of fine particles having an average particle size of 0.05 μm or more and 1 μm or less. 2. The plastic bottle is a bottle formed from one or more polyesters selected from the group consisting of polyethylene terephthalate, polyethylene naphthalenedicarboxylate, and copolymers and blends of polyethylene terephthalate and polyethylene naphthalenedicarboxylate. The bottle according to claim 1. 3. The fine particle is a true spherical silica.
Or the bottle according to 2. 4. The bottle according to claim 1, wherein the fine particles are zeolite.